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T8400C1099, T8401C1031 ELECTRONIC THERMOSTATS
5 69-1484-2
SYSTEM Switch
System switch settings control thermostat operation as
follows:
Cool: The thermostat controls the cooling system.
Off: Both heating and cooling are off.
Heat: The thermostat controls the heating system.
Slide the SYSTEM switch in the bottom right corner of
the thermostat to select the desired system setting.
Fig. 12. Digital display and system
switches (FAN and SYSTEM).
Set Temperature Setpoint
NOTE: Temperature setpoint range is 40° to 99°F (5° to
37°C).
The temperature setpoint and the room temperature are
shown separately on the digital display. The ▼ indicator
points to Set when the temperature setpoint is displayed
and to Room when the room temperature is displayed.
.
To set temperature setpoint:
1. Select Heat or Cool by sliding the SYSTEM switch
in the lower right corner of the thermostat to the
desired mode. See Fig. 12.
2. To display the temperature setpoint on the digital
display, press either the ▲ or ▼ key once. The tem-
perature setpoint is displayed for approximately
five seconds as the indicator points to Set and
flashes.
3. To increase the temperature setpoint press the ▲
key. Each press changes the setpoint one degree;
press and hold to change the setpoint several
degrees.
4. To decrease the temperature setpoint press the ▼
key. Each press changes the setpoint one degree;
press and hold to change the setpoint several
degrees.
Setting °F/°C Indication and Heat Cycle Rate
NOTE: To save changes to the °F/°C indication, the
heat cycle rate and the C3/C1 temperature
control, tap the ▲ key until exiting the installer
setup.
To set the °F/°C indication, the heat cycle rate and the
C3/C1 temperature control:
1. If the temperature is displayed in °F, set the tem-
perature setpoint to 52°F. If the room temperature
is displayed in °C, set the temperature setpoint to
11°C.
OPTIONAL SYSTEM CHECKOUT
When in steps 2 and 3 only, the
▼
key can be used to
turn heat or cool outputs on and off. Change the
SYSTEM switch setting to test heat or cool outputs. No
action takes place If the system switch is in the Off
position.
Examples:System setting at HEAT: If heat is on, the ▼
key turns it off; if heat is off, ▼ turns it on.
System setting at COOL: If cool is on, ▼ key
turns it off; if cool is off, ▼ turns it on.
2. Press the ▲▼ keys simultaneously for more than
one second to light all segments on display and to
enter installer setup mode. When the keys are
released, a two-digit software revision code is dis-
played.
SYSTEM
Cool Off Heat
Auto On
FAN
M14678
TEMPERATURE DISPLAY
INCREASE SETTING
DECREASE SETTING
FAN SWITCH
SYSTEM SWITCH
S
et
Room
INDICATOR
ROOM TEMPERATURE
SETPOINT TEMPERATURE
M1467
9
M1468
0
M1468
1
M1468
2
M1468
3
M1468
4
M1468
5
M1468
6